If you look on the New Classic thread, Steve Sell states that the last few iterations of Naim amps can use any cable at any length and that only the early Chrome bumper stuff required. One of his comments is as follows:
In others he goes on to state that they tested all sorts of cables including high capacitance ones with runs from as short as 1m to long runs going up and down the corridors and that this inductance issue is really going back only to early Chrome Bumper.